Stoker.



J. HARRENGTON.

STOKER.

APPLICATION FILED MAY 21, 1919.

1 ,326, 5 9 1 Patented Dec. 30, 1919,

JOSEPH HARRINGTON, 0F RIVERSIDE, ILLINOIS.

STUKER.

Application filed May 21, 1919; Serial m'o. 298,587.

To all whom it may concern:

Be it known that T, JOSEPH HARRINGTON, a citizen of the United States, residing at Rim erside, in the county of Cook and State of llllinois, have invented a new and useful Improvement in Stokers, of which the fol lowing is a specification,

My invention relates to certain new and useful improvements in stokers and is fully described and explained in the specification and shown in the accompanying drawings,

in which:

Figure 1 is a top plan of a portion of the fuel carrying surface of my improved stoker; Fig. 2 is a plan of one of the grate bars; Fig. 3 is a side elevation thereof;.Fig. l is a section on the line 4: of Fig. 3; Fig. 5 is a section on the line 5 of Fig. 1, and Fig. 6 is the bottom plan of one of the grate bars.

The present grate bars are designed to be employed in connection with a stoker of the general type shown in my application ed on even date herewith and allotted Serial No. 298,586, and for this reason only the bars themselves and their mode of assembly are here illustrated. In that application I have illustrated a carrying chain of usual construction having transverse bars for carrying the grate bars, the transverse bars .in each case being located toward the forward part of the carrying links so that as the chain bends in going around the wheels or rollers at the inward end of the stoker each series of grate bars move forward and downward only with respect to the bars of the following series. bar here illustrated is designed to be so employed, and if another method of movement were employed some modification of thepresent design might be desirable.

in the drawings each grate bar is shown provided with an enlarged central portion transversely grooved or slotted on its lower surface to be slipped on to the transverse bar which. supports it. Each grate bar 7 has a forward projection 8 upon one corner, and a rear projection 9 on the. opposite corner, the arrangement thus being such that the bars are generally symmetrical and can be threaded upon the transverse bars which support them in such a manner that the extensions of the grate bars in adjacent series overlap each other, the rear extensions upon one series lying between the forward The particular form of extensions upon the adjacent series so as to form a substantially complete surface.

ile the forward and rear extensions of the grate bars have the same width, there is a difierence. The forward extensions have their upper surfaces of the full width of the extensions, whereas the rear extensions have their upperfsurfaces'narrow and "are provided with an outwardly extending flange 10, set below the top surface a distance somewhat greater than the thickness'of the surface of the forward extension. Thus when the grate bars are set together the rear extensions lie between the forward extensions of the grate bars at the rear, and the flanges 10' underlie the margins of the forward ex tensions. In this manner there is provided a draft opening between the grate bars, but the draft opening has when viewed in crosssection as in Fig. 5 a right angle bend so that the draft has to enter horizontally over the flange 10 and then pass up into the fuel body.

As a result of this construction it is pos-v sible with the present. device to employ exceedingly fine fuel such as would sift through grate surfaces of ordinary construction to a prohibitive extent. If there is any tendency for the fine fuel to sift through it is arrested by the projecting flange 10, and

Patented Dec. 30, 1919.

ward with respect to the following bars so opened and cleared out each time the grate bar pass around the circuit of theirmovement. If the bars are so employed thatthe rear portions of each bar rise instead of fall with respect to the following bars, as is the practice in connection with some stokers,

then the'present bars would have to be arranged in the reverse direction so that the larger longitudinal extension which is above that the draft openings are completely vice as broadly as is permitted by the state of the art.

I claim:

1. A traveling grate stoker having grate 7 bars arranged in transverse rows, the grate bars in each row extending forwardand back beside and between the grate bars in adjacent rows, each bar having a narrow rear extension provided with laterally extending flanges on a plane below that of its top surface, said flanges being adapted to underlie the forward extensions of the ad- 'jacent barin spaced relation thereto to form a tortuous draft opening therebetween.

2. As an article of manufacture a grate bar having a' central portion and portions extending in opposite directions therefrom and located on opposite corners thereof whereby the bar is generally symmetrical,

one extension having its top surface narrower than the other, and being provided With a laterally extending flange surrounding such narrow portion whereby when a series of such bars are assembled in rows the extensions of the bars in adjacent rows Will lie beside each other, and the flanges on the bars in one row will underlie the larger extensions of the bars in the adjacent row in spaced relation thereto to form therewith tortuous draft passages.

3. A traveling grate stoker comprising rows of grate bars having extensions lying beside and between each other, certain of the extensions being provided With flanges underlying the other extensions in spaced-relation thereto to form tortuous draft passages, the arrangement being such that as the surface is bent as in passing over a roller the bars 'Will'beseparated to open the passages therebetween.

In testimony whereof I have hereunto set my hand and seal this 12th day of May,

JOSEPH HARRINGTON. 1; s.] 

